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Related Experiment Videos

Nematode worm egg output by ewes.

K J Stafford1, D M West, W E Pomroy

  • 1Department of Veterinary Clinical Sciences, Massey University, Palmerston North, New Zealand.

New Zealand Veterinary Journal
|February 1, 1994
PubMed
Summary
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Parasite monitoring in ewe flocks revealed seasonal variations in strongylate nematode egg counts. Mixed-age ewes peaked in October, while two-tooth ewes showed different patterns, impacting pasture contamination strategies.

Area of Science:

  • Veterinary Parasitology
  • Sheep Health Management
  • Animal Science

Background:

  • Routine monitoring of parasite burdens in ewe flocks is crucial for effective farm management.
  • Understanding seasonal parasite dynamics in sheep is essential for controlling nematode infections.
  • Massey University Veterinary Clinic data from 1980-1991 provides a long-term perspective on ewe parasitism.

Purpose of the Study:

  • To analyze fecal strongylate nematode egg counts in ewe flocks over a 12-year period.
  • To investigate the influence of ewe age (two-tooth vs. mixed-age) and month of the year on parasite burdens.
  • To assess the potential role of ewes in pasture contamination.

Main Methods:

  • Analysis of 401 fecal flock samples from routine monitoring.

Related Experiment Videos

  • Categorization of ewes into age groups: two-tooth (16-23 months) and mixed-age (>2 years).
  • Quantification of strongylate nematode egg counts per gram of feces (epg) for each sample.

    • Main Results:

    • Mixed-age ewes exhibited the lowest mean egg counts in January (82 epg) and peaked in October (539 epg).
    • Two-tooth ewes showed relatively stable egg counts from January (240 epg) to June (294 epg), decreasing in July (156 epg).
    • 8% of mixed-age and 12% of two-tooth ewe submissions exceeded 500 epg, indicating significant parasite burdens in some flocks.

    Conclusions:

    • Ewe age significantly influences strongylate nematode egg count patterns throughout the year.
    • Seasonal variations in egg counts highlight periods of higher potential pasture contamination.
    • These findings underscore the importance of considering ewe parasite burdens in developing effective farm-level parasite control strategies.